package com.bjc.base.utils;

import java.lang.reflect.Field;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

import lombok.extern.slf4j.Slf4j;

/**
 * 获取spring实体对象（spring管理的都是代理对象）
 * 
 * @author 许自辉
 * @date 2017年8月1日 下午7:46:34
 */
@Slf4j
public class AopTargetUtils {

	/**
	 * 获取 目标对象
	 * @param proxy
	 *            代理对象
	 * @return
	 * @throws Exception
	 */
	public static Object getTarget(Object proxy){
		if (!AopUtils.isAopProxy(proxy)) {
			// 不是代理对象
			return proxy;
		}
		try {
			if (AopUtils.isJdkDynamicProxy(proxy)) {
				return getJdkDynamicProxyTargetObject(proxy);
			} else {
				return getCglibProxyTargetObject(proxy);
			}
		} catch (Exception e) {
			log.error("AopTargetUtils获取代理对象异常："+e.getMessage());
		}
		return proxy;

	}

	private static Object getCglibProxyTargetObject(Object proxy) throws Exception {
		Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
		h.setAccessible(true);
		Object dynamicAdvisedInterceptor = h.get(proxy);
		Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");
		advised.setAccessible(true);
		Object target = ((AdvisedSupport) advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();
		return target;
	}

	private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {
		Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
		h.setAccessible(true);
		AopProxy aopProxy = (AopProxy) h.get(proxy);
		Field advised = aopProxy.getClass().getDeclaredField("advised");
		advised.setAccessible(true);
		Object target = ((AdvisedSupport) advised.get(aopProxy)).getTargetSource().getTarget();
		return target;
	}

}
